A new study has revealed that scented products used indoors can create air pollution comparable to vehicle emissions outside. Researchers warn that the tiny particles produced by these products could pose serious health risks when inhaled.
Conducted by Purdue University, the study examined how flame-free scented candles release microscopic particles into the air. These nanoparticles, small enough to enter the lungs, are formed when the fragrances react with ozone in indoor environments.
Brandon Boor, an associate professor at Purdue, explained that these particles are created through terpenes—natural compounds found in scented products. Similar emissions occur when using citrus-scented air fresheners, essential oils, or even peeling citrus fruits.
The research team tested wax melts in a controlled indoor environment and found that the concentration of nanoparticles was similar to those produced by burning candles, gas stoves, and even diesel engines. These particles, when inhaled, can enter the bloodstream and potentially reach the brain.
Scientists suggest that further studies are needed to understand the long-term health effects. However, the findings highlight the need for better indoor air quality management, especially in building design and ventilation systems.